1 Scope and object
This part of IEC 60252 applies to motor capacitors intended for connection to windings of asynchronous motors
supplied from a single-phase system having a frequency up to and including 100 Hz,
and to capacitors to be connected to three-phase asynchronous motors so that these
motors may be supplied from a single-phase system.
This standard covers impregnated or unimpregnated capacitors having a dielectric of
paper, plastic film, or a combination of both, either metallized or with metal-foil
electrodes, with rated voltages up to and including 660 V.
Motor start capacitors are covered by IEC 60252‑2.
NOTE The following are excluded from this standard:
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– shunt capacitors of the self-healing type for a.c. power systems of up to and including 1 000 V nominal voltage (see IEC 60831‑1);
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– shunt capacitors of non-self-healing type for a.c. power systems of up to and including 1 000 V nominal voltage (see IEC 60931‑1);
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– shunt capacitors for a.c. power systems having a nominal voltage above 1 000 V (see IEC 60871‑1);
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– capacitors for induction heat-generating plants, operating at frequencies between 40 Hz and 24 000 Hz (see IEC 60110‑1);
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– series capacitors (see IEC 60143);
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– coupling capacitors and capacitor dividers (see IEC 60358);
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– capacitors to be used in power electronic circuits (see IEC 61071);
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– small a.c. capacitors to be used for fluorescent and discharge lamps (see IEC 61048);
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– capacitors for suppression of radio interference (IEC publication under consideration);
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– capacitors intended to be used in various types of electrical equipment and thus considered as components;
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– capacitors intended for use with d.c. voltage superimposed on a.c. voltage.
The object of this standard is
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a) to formulate uniform rules regarding performance, testing and rating;
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b) to formulate specific safety rules;
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c) to provide a guidance for installation and operation.